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Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 35,200 | $ 24,673
Current Loans | 4,365,032 | 4,207,375
Total Loans | 4,400,232 | 4,232,048
Accruing Loans 90 Days or More Past Due | 1,962 | 1,841
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 17,652 | 16,404
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,948 | 2,831
90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 12,600 | 5,438
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,501 | 803
Current Loans | 569,130 | 502,094
Total Loans | 571,631 | 502,897
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,045 | 1,825
Current Loans | 1,122,351 | 1,108,935
Total Loans | 1,123,396 | 1,110,760
Accruing Loans 90 Days or More Past Due |  | 521
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,664 | 4,124
Current Loans | 320,749 | 328,477
Total Loans | 325,413 | 332,601
Accruing Loans 90 Days or More Past Due | 513 | 493
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,506 | 4,275
Current Loans | 743,723 | 672,414
Total Loans | 748,229 | 676,689
Accruing Loans 90 Days or More Past Due | 369 | 193
Real Estate [Member] | 30 to 59 Days Past Due [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,255 | 441
Real Estate [Member] | 30 to 59 Days Past Due [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 611 | 1,149
Real Estate [Member] | 30 to 59 Days Past Due [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,742 | 2,840
Real Estate [Member] | 30 to 59 Days Past Due [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,559 | 2,842
Real Estate [Member] | 60 to 89 Days Past Due [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 96 | 179
Real Estate [Member] | 60 to 89 Days Past Due [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 16 | 108
Real Estate [Member] | 60 to 89 Days Past Due [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 649 | 636
Real Estate [Member] | 60 to 89 Days Past Due [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 531 | 609
Real Estate [Member] | 90 Days and Greater [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 150 | 183
Real Estate [Member] | 90 Days and Greater [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 418 | 568
Real Estate [Member] | 90 Days and Greater [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,273 | 648
Real Estate [Member] | 90 Days and Greater [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,416 | 824
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 3,638 | 2,626
Current Loans | 1,047,547 | 982,136
Total Loans | 1,051,185 | 984,762
Accruing Loans 90 Days or More Past Due | 608 | 152
Commercial and Financial [Member] | 30 to 59 Days Past Due [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,269 | 2,278
Commercial and Financial [Member] | 60 to 89 Days Past Due [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,628 | 161
Commercial and Financial [Member] | 90 Days and Greater [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 741 | 187
Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 3,225 | 3,358
Current Loans | 280,652 | 265,511
Total Loans | 283,877 | 268,869
Accruing Loans 90 Days or More Past Due | 274 | 278
Consumer Non-real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,046 | 2,237
Consumer Non-real Estate [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 760 | 772
Consumer Non-real Estate [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 419 | 349
Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 14,078 | 5,621
Current Loans | 127,404 | 156,995
Total Loans | 141,482 | 162,616
Accruing Loans 90 Days or More Past Due | 45 | 132
Other Loans [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,345 | 3,565
Other Loans [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 958 | 295
Other Loans [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 7,775 | 1,761
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,543 | 2,041
Current Loans | 153,476 | 190,813
Total Loans | 155,019 | 192,854
Accruing Loans 90 Days or More Past Due | 153 | 72
Acquired Loans [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 825 | 1,052
Acquired Loans [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 310 | 71
Acquired Loans [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 408 | $ 918

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